Current Electricity
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Current Electricity
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25 Questions

1. A battery is charged at a potential of 15V for 8hours when the current flowing is 10AThe battery ondischarge supplies a current of 5A for 15 hoursThemean terminal voltage during discharge is 14VThe-œwatt-hour- efficiency of the battery is [2004]
2. Direct current is passed through a copper sulphatesolution using platinum electrodesThe elementsliberated at the electrodes are [1993]
3. If a wire of resistance R is melted and recasted tohalf of its length - then the new resistance of the wire willbe [1995]
4. Cell having an emf ε and internal resistance r isconnected across a variable external resistance RAs theresistance R is increased - the plot of potential differenceVacross Ris given by : [2012M]
5. In electrolysis - the amount of mass deposited orliberated at an electrode is directly proportional to[2000]
6. Three resistances each of 4: are connected to forma triangleThe resistance between any two terminals is[1993]
7. If specific resistance of a potentiometer wire is 10 -“7 Ω m - the current flow through it is 0.1 A and the crosssectional area of wire is 10 -“6 m2 then potential gradientwill be [2001]
8. If a negligibly small current is passed through awire of length 15 m and of resistance 5 Ω having uniformcross-section of 6 × 10 -“7 m2 - then coefficient ofresistivity of material - is [1996]
9. A 5°C rise in temperature is observed in aconductor by passing a currentWhen the current isdoubled the rise in temperature will be approximately[1998]
10. In producing chlorine through electrolysis - 100watt power at 125 Vis being consumedHow muchchlorine per minute is liberated? E.C.Eof chlorineis0.367 × 10 -“6 kg/ coulomb[2006]
11. Three resistances P - Q - Reach of 2Ω and anunknown resistance S form the four arms of aWheatstone bridge circuitWhen a resistance of 6Ω isconnected in parallel to S the bridge gets balancedWhatis the value of S? [2007]
12. Resistances n - each of r ohm - when connected inparallel give an equivalent resistance of RohmIf theseresistances were connected in series - the combinationwould have a resistance in ohms - equal to [2004]
13. The rate of increase of thermo-“e.m.fwithtemperature at the neutral temperature of athermocouple [2011]
14. Two electric bulbs - one of 200 V - 40Wand other of200 V - 100 W are connected in a domestic circuitThen[2000]
15. n equal resistors are first connected in series andthen connected in parallelWhat is the ratio of themaximum to the minimum resistance? [1989]
16. A battery of 10 V and internal resistance0.5 Ω isconnected across a variable resistance RThe value of Rfor which the power delivered is maximum is equal to[1992 - 2001]
17. If voltage across a bulb rated 220 Volt-100 Wattdrops by 2.5% of its rated value - the percentage of therated value by which the power would decrease is :[2012]
18. A 5-“ampere fuse wire can withstand a maximumpower of 1 watt in the circuitThe resistance of the fusewire is [2005]
19. A thermocouple of negligible resistance producesan e.m.fof 40 μV/°C in the linear range of temperature.A galvanometer of resistance 10 ohm whose sensitivityis 1 μA/div - is employed with the termocoupleThesmallest value of temperature difference that can bedetected by the system will be [2011M]
20. A wire of a certain material is stretched slowly byten per centIts new resistance and specific resistancebecome respectively : [2008]
21. Fuse wire is a wire of [2003]
22. Two wires of the same metal have same length - buttheir cross-sections are in the ratio 3 ΩThey are joinedin seriesThe resistance of thicker wire is 10 ΩThe totalresistance of the combination will be [1995]
23. Three equal resistors connected across a source ofe.m.ftogether dissipate 10 watt of powerWhat will bethe power dissipated in watts if the same resistors areconnected in parallel across the same source of e.m.f.?[1998]
24. Two identical batteries each of e.m.f 2V and internalresistance 1Ω are available to produce heat in anexternal resistance by passing a current through itThemaximum power that can be developed across R usingthese batteries is [1990]
25. Si and Cu are cooled to a temperature of 300 K - then resistivity? [2001]

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